It is strange. Currently I cannot reproduce the error no matter what I do. I only get it to crash if I use _WinHttpReceiveResponse outside of __WINHTTP_STATUS_CALLBACK now. AutoIt:3.3.6.1 X64, AutoIt:3.3.6.1 X86, AutoIt:3.3.7.8/X64 AutoIt:3.3.7.8/X86 (Os:WIN_7/SP1/X64 OSLang:0407) This was the script: #AutoIt3Wrapper_AU3Check_Parameters=-d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6 #include "WinHttp.au3" #include "Debug.au3" ConsoleWrite( _DebugBugReportEnv( ) & @CRLF) Opt("MustDeclareVars",